Connect the serial interface to the customer control equipment
The serial interface is available in RS485 or RS232 opons which can be selected using the slide
switch located adjacent to the main power lead.
Refer to Figure 4 on page 30. To adjust the slide switch, toggle the slide switch using a small
tool. The motor controller default seng is RS232 serial interface. Be sure to replace the round
seal in order to ensure the IP rang of the pump is sll achieved.
CAUTION:
When connecng the pump to a PC, note that the 0 V pin on the RS232 connector may be
connected to earth through the PC. If this is the case, ensure that the 0 V rail of the 24 - 48
V d.c. supply is not also connected to earth at some other point such as at the power
supply. If the 0 V rail of the 24 - 48 V d.c. supply will not be connected to earth at the PC,
an opto-isolated interface to the PC should be used.
The nEXT85 pump can connect directly to the RS485 or RS232 serial input on the control
equipment or a PC as shown in Figure 5 on page 30 and Figure 6 on page 31. In this
conguraon the PC is the serial link master and the nEXT85 pump is the slave. The distance
over which the serial link will work is dependent on any dierence in voltage between the 0 V
at the sending and receiving end. If the 0 V reference at the receiving end is within 0.3 V of the
0 V Control Reference pin on the nEXT85 pump control connector then the serial link should be
capable of operang at distances up to 6 m. An interface circuit external to the nEXT85 pump
may be required for longer distances.
The soware in the nEXT85 pump is capable of operang with several pumps connected to a
single serial link master. This is referred to as mul-drop mode. The RS485 opon is
recommended for mul-drop mode. With the RS232 opon selected, some addional
hardware will be required to link several nEXT85 pump units to a single serial link master. A
concept drawing of one possible arrangement is shown in Figure 18 on page 100. Conversely
when the RS485 opon is selected, connecng several nEXT85 pumps to a single master
becomes a simple wiring exercise as shown in Figure 19 on page 101.
B8G0-00-880A - Install the nEXT85
Page 29
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